In the DBLock constructor, we early return if _globalLock was not successfully locked. This early return was added as part of
SERVER-32682 to account for deadline running out. However, in cases where deadline is Date_t::max(), we expect _globalLock.isLocked() to be true at this point, since this deadline is unreachable. An invariant should be added that the deadline is not Date_t::max() before early returning in this case.